package com.dengc.springboot.utils;



import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.StrUtil;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.dengc.springboot.entity.User;
import com.dengc.springboot.service.IUserService;
import net.bytebuddy.asm.Advice;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.Date;

@Component
public class TokenUtils {

    private static IUserService  staticUserService;

    @Resource
    private  IUserService userService;

    @PostConstruct
    public void setUserService(){
        staticUserService = userService;
    }
    /**
     * 生成token
     * **/
    public static  String genToken(String userId, String sign){
       return JWT.create().withAudience(userId) //将userid 保存到token里面，作为载荷
                .withExpiresAt(DateUtil.offsetHour(new Date(),2)) //2小时后token过期
                .sign(Algorithm.HMAC256(sign)); //以password作为秘钥
    }

    /**
     * 获取当前登录的用户信息
     * **/
    public static User getCurrentUser(){
            try {
                HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
                String token = request.getHeader("token");
                if (StrUtil.isNotBlank(token)) {
                    String userId = JWT.decode(token).getAudience().get(0);
                    return staticUserService.getById(Integer.valueOf(userId));
                }
            }catch (Exception e){
                return null;
            }
            return null;
    }
}
